Open AccessRobust H ∞ control of single input‐delay systems based on sequential sub‐predictors
Author(s) -
Najafi Majdeddin,
Sheikholeslam Farid,
Wang QingGuo,
Hosseinnia Saeed
Publication year - 2014
Publication title -
iet control theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.059
H-Index - 108
eISSN - 1751-8652
pISSN - 1751-8644
DOI - 10.1049/iet-cta.2012.1004
Subject(s) - control theory (sociology) , state (computer science) , robust control , computer science , controller (irrigation) , disturbance (geology) , smith predictor , control (management) , control system , mathematics , algorithm , control engineering , engineering , pid controller , artificial intelligence , temperature control , paleontology , agronomy , electrical engineering , biology
This study presents an approach to the H ∞ control of linear input‐delay systems. First, an H ∞ state predictor is introduced for dead‐time systems with disturbance input and measurable outputs. The author's proposed method focuses on optimisation of the disturbance propagation in sequential sub‐predictors (SSP). Each of the predictors is employed to forecast the state for one portion of the delay. The H ∞ performance of the prediction error can be improved by increasing the number of predictors. Consequently, an H ∞ controller is designed for the standard H ∞ problem of dead‐time systems using SSP. More importantly, the SSP method is extended to the robust H ∞ control in presence of uncertainties. Some examples are given to illustrate the effectiveness of proposed method.